Metal sawing machine



July 23, 1946. E A 2,404,707

METAL SAWING MACHINE Filed Aug. 14, 1940 6 Sheets-Sheet 1 ifflkolaZ/ti V y 9 T. HASEGAWA ZAMWW METAL SAWING MACHINE Filed Aug. 14, 1940 6 Sheets-Sheet 2 July 23, 1946. T. HASEGAWA 2,404,707

METAL SAWING MACHINE Filed Aug. 14, 1940 6 Sheets-Sheet 5 .moww

y 23, 1946. T. HASEGAWA METAL SAWING- MACHINE Filed Aug. 14, 1940 6 Sheets-Sheet 5 Patented July 23, 1946 METAL SAWING MACHINE Takao Hasegawa, Osaka, Japan; vested in the V r Alien Property Custodian Application August 14, 1940, Serial No. 352,616

. In Japan August 30, 1939 My invention relates to improvements in metal sawing machines in which two vertical bow saws are provided, lying in the same vertical plane, and having means which move the saws up and down and having also means which in relation to the said upward and downward movement draw the saws toward one another when the saws are moving downwardly and which move the saws away from one another when they are moving upwardly, and the objects of the improvements are, first, to construct machines which cut metals from both sides simultaneously; second, to cut metals with theleast strain on the cut faces of the metals; and third, to avoid unnecessary force which would otherwise be exerted in the sawing operation, thereby attaining higher sawing efficiency, as compared with similar machines heretofore in use. Y

I attain these objects 'by mechanism illustrated in the accompanying drawings, in which Fig. 1 is a front elevation of a machine embodying the invention; I I

Fig. 2 is a rear elevation;

Fig. 3 is a vertical section of the machine taken on the line 3-3 of Fig. 1;

Fig. 4 is a sectional plan of a part of the machine taken on the line 4-4 of Fig. 3;

Fig. 5 is an elevation showing connecting pipes of oil pressure pumps;

Fig. 6 is an elevation showing the operating mechanism, the machine frame and other parts of the machine being omitted;

Fig. 7 is a side elevation corresponding to Fig. 6;

Fig. 8 is an enlarged sectional plan of a part of the machine taken on the line 8-8 of Fig. 6;

Fig. 9 is an enlarged section of a part of the machine taken on the line 9-9 of Fig, 6;

Figs. 10 and 11 are elevations of the apparatus shown in Fig. 3 as it appears in the last two operations;

Fig. 12 is an enlarged section of the oil pressure regulator;

Figs. 13, 14 and 15 are diagrammatic illustrations showing the operation of the oil pressure regulator; and

Figs. 16, 1'7 and 18 are diagrammatic illustrations showing the rotation of the operating crank corresponding respectively to Figs. 13, 14 and 15.

Referring to the drawings in detail, I, I (Fig. 6) are the two vertically disposed bow saw blades, and 2, 2 are the bow frames to which the blades I, I, respectively, are fixed at both ends. 3, 3 (Fig. land Fig. 2) are the machine frames which carry the frames 2, 2, and in the center of which 1 8 Claims. (Cl. 2974) is an opening 5 into which the material 4 to be cut is inserted. E are the bolts holding the machine frames 3, 3 together. I and 8 are respectively the receiving seat and the clamp which hold the material 4 therebetween in the opening 5, and on the clamp 8 are provided the oil pressure cylinder 9 and ram Ill, to operatethe clampt. 2-a (Fig. 6) are horizontal guide grooves at-the upper part and at both. the front andrear sides, of the bow-shaped frames 2,2, and2-b (Figs; 6 and -8) are the vertical guide grooves at one side of each of the frames 2, 2. is the guide block common to the saws I, I, and'is formed of two plates connected to hold the frames, 2, 2 therebetween, and having projections II-a (Fig. 9) to correspond with the horizontal grooves 2-11 of the frames 2, 2. By means of these projections II-a, the upward and downwardmovements of the saws I, I are accomplished, and they serve to guide the rightward and leftward movements of the saws I, I. I2 are guide blocks provided for the saws I, I I, each having a projection I2-ato correspond with the vertical groove 2--b (Fig.8) of the frame .2, and these projections I2a accomplish the rightward and leftward movements of the saws I, I and also serve to guide them:- ward and downward movements of the saws I, I.

I2b are the horizontal guide rods secured at both front and back sides of the guide blocks I2 and received in the horizontal channels 3-b .in guide paths 3-a (Fig. 3) of the machine frames 3, 3 in order not only to retain the guide blocks I2 in their position but also to guide the rightward and leftward movements of the guide blocks I2. The frames 2, 2 and guide blocks I2, I2 slide along the guide paths 3-a of the machine'frames 3, 3, whereby they are prevented from rocking.

I4 is a horizontal lever, one end IQ-b of which is connected to the central guide block II through a link I5, while the other end I l---av is supported by a bearing I6 (Fig. 1) which is adjustably mounted to move on the machine frame 3. I4 c is the supporting pintle by which the end I4--a is pivoted on the bearing I5, and I4-d is the pin tle connecting the end I4-b with the link I5.

IE-a is the pintle connecting the link I5 with the block II. One end of this pintle I5-a, extending into the vertical guide slot 3o' (Fig. 1) in the front'machine frame 3, is connected to the slide Il whichis slidably mountedin the guide slot .'c. so that the block II is allowed onlyvertical movement. I4e (Fig. 6) is the guide slot in the lever I4. A slide I8 which is mounted in this slot I l-e is connected to the crank Iii-a of the rotatable shaft I9 supported in the bearing 20 3 (Fig. 3) on the machine frame 3, and driven by the motor 27 through gears 2!, 22 and 23, pulleys 24 and. 25 and belt 26, as shown in Fig. 2. By rotating shaft 59, the lever [A (Fig. 6) is moved up and down and consequently imparts upward and downward motion to both saws I, I, throughlink 1,5.and block II. I

28 (Fig.6) is an o'ilpressure cylinder mounted on the machine frames 3, 3 in the space above the block H, and having two pistons 29, 29 therein. Each piston 29 has a piston rod 29-11 connected to the guideblocks l2, respectively, through links 38 and vertical levers 3! which are pivoted to the front and back machine frames 3, 3, on pintles 3la. Simultaneously withthe start of the descent of both saws I, I, :pressure oil is fed through the aperture 28-;a "in :the middle of the cylinder 23 so as to push the ,pis-

tons 29 outwardly, and cause pressure on both.

saws i, l, causing them to move toward the material iwhile-when the saws I, i start to ascend the pressure oil is forced out of the aperture f28-a in the middle of the -cylinder'28, pressure oil "being fed into the cylinder 28 through apertures 28'b at the ends of the cylinder 28, to

operate on the pistons 29 from the opposite direction'causing the saws l, i to separate, moving them away from the material 4.

The invention also provides means by which the edges of the .saws I, i are 'moved slightly from the cut faceof the -material 4% when the saws 1,1 approach the completion of the sawing -operation, avoiding'violent "shaking of the saws "I, and at the same time utilizing nearly the entire length of the saws I, I, to perform the cutting operation most efficiently.

Fig.5 shows thehigh pressure aperture 28a in the middle. of the cylinder 28 and the low pressure apertures 2-9-- b in the ends of the cylinder 28,-connectedrespectively to the high pres sure pump 3'4 and the low pressure pump 35,

throu'ghthe' respective pipes 32 and 3-3. Ihese pumps s iand as are operated by suitable power transmission "means (not shown) from the shaft of the pulley, 24.

The low pressurefoil pipes as are constantly 'con neoted'with the cylinder 28 so that the low pressure bil -being fed :inte the cylinder exerts pressure on thepistons :29, 29, and the excess oil escapes into the oil tank 36 through the safety valve 3-3-0; and pipe 3'.i*b. The high pressure oil pipe 32 is not connected directly to the high pressure pump 34 but is connected thereto through the regulator 137 and oil pipe 32-40.

Referring particularly "to the construction and 4 operation of the oil pressure regulator 31, in the valve chamber Bil-a leading to the high pressure oil pipe 232, there are valve seats 31-1), 31-1: and plate 'valves 38 and 59. The valve 38 istpressed against the seat w3ib by spring lfl,

"while'valvefis is disposed away from seat 3'ic by spring' ii.

0i] and gives the requisite :pressure to force the saws .l,- 1 toward the material 3, for their cutting operation. '43 is a safety valve which excess oil opens to flow out through pipe 4-4 into the oil tank'36. By :rotating the screw lid 45, the spring .ment of the saws =1, i

46 can be adjusted so that the safety valve 43 controls the force of the oil pressure which operates on the saws I, l. The plate valve 38 carries 'a valve rod 33a which when pushed from outside of the valve chamber 3'i'a moves the valve into the valve chamber 3l-a and passes together with the high pressure oil coming from the pump 34 into the oil-tank 36 through pipe 3 1, with the consequence that the pressure in pipe BiZzfalls so that the pistons 29, 29 are pushed back by the low pressure oil in the cylinder 28, and during such time,.the saws i, i move away from the material 5. However, if the inner end of the-valverod38-'-a pushesthe other valve rod 3-9-11, the spring t: is compressed-and 'the 'v'alve 39 is seated on the seat 3l-c, and furtherpressure compresses the spring 42, as the rod 39-a slides through the valve (it. In this condition-of the parts, shown in Fig. 15, the oil is prevented from flowing up from the cylinder '28, 'so that the pistons 28, "Ztdo not move in the cylinder 28, and the-separating movement 'of the saws i, -l ceases. Th separating movementof the saws l, I begins when the tappet 28 (Fig. "5) pushes the end of the rod 3-a projecting outside of the 'valve chamber Si-a. This tappet 4 B is actuated by a bell-crank lever 4'9 carrying roller 49-0, which is moved 'by cam 59021111661 by shaft t9.

Figs. '16, 1-7 and 18 are diagrammatic illustra tions corresponding to Figs. '13, 14 and '15 and show the position into which the cran-kpin Hl'b 'moves. Fig. 16 shows that while the high presthe material t, the crank pin 19-?) moves from the lower dead center point B to the next point C, and from this figure it will be seen that the saws are removed from the material 3, during a very short portion of the travel of the crank pin 59-1) and consequent short vertical move FigHlB shows that while the saw I, i are held immovable (Fig. 15),the crank pin 19 moves from the point C to the upper dead center A, raising the saws i, l, and from this figure it will be seen that'duringthe ascent of the saw i, i, they are held immovable horizontally'inpositions but little removed from the material 3, so that they need be moved only.

a short distance'to exert pressure on thenext working stroke. A 7

Further the invention provides means-by which when the saws l, 'l have reached the central part of the material 4,'they act alternately, after they have come within certain limitsof mutual contiguity, so that there shall always be a small space, left between the two 'saws i, t to obviateany pee-1 sibility of contact with one another. As shown in Figs. 10 and I1, eccentric'discs 5| are provi'ded ends of the lovers 35; .As these discs rotate on their shafts fill-4t in I proper co-ordinated positions when they are in to bear against the upper the position shown in Fig. 10, the upper end of the "left lever-3i extends outwardlyto-the left and the lever pushes the left saw l to the right, without any restraint fromthe left disc 5|, and the right lever 5| is restrained from moving toward the right by the right disc 5| so that the right saw I is restrained from moving the full distance to the left. Similarly, as shown in Fig. 11, the levers 3| operate reversely so that the left l is restrained while the right saw is permitted to move forward the full distance. Thus it will be seen that by this mechanism the saws l, l are prevented from contact when they approach the central part of the material 4.

The gearing for these eccentric discs 51 is shown in Figs. 1 and 3. Bevel gears 52 are fixed on the shafts 5I-a of the eccentric discs 5!, respectively, and mesh with bevel gears 53, respectively, secured on the horizontal shaft 5 which is journaled in bearings 55 on the front of the machine frame. This horizontal shaft 54 has a bevel gear 56 which meshes with the bevel gear 51 which i fixed on the vertical shaft 58 journaled in the bearings 55' on the front of the machine frame. On the upper end of the vertical shaft 58 there is fixed the bevel gear 59 which meshes with the bevel gear 60 fixed on the shaft l9.

What I claim is:

1. In a sawing machine, the combination of means to support a mass of material to be sawed; a pair of saws disposed adjacent opposite sides of said mass, respectively, and adapted to be reciprocated along two paths lying in a plane transverse to the longitudinal axis of the mass, said paths being at an angle of 90 to one another; means adapted to reciprocate said saws along one of said paths; and means adapted to reciprocate said saw-s along the other of said paths, said two reciprocating means being adapted to so co-act that the saws are moved toward each other along one of said paths, to cut progressively deeper into said mass, on each stroke in one direction along the other of said paths, are moved along said first path, away from each other and slightly away from said mass, at the end of said stroke and during a portion of the stroke in the opposite direction along the second path, and are held against movement along said first path during the remainder of the last mentioned stroke.

2. In a sawing machine, the combination of means to support a mass of material to be sawed; a pair of saws disposed adjacent opposite sides of said mass, respectively, and adapted to be re-- ciprocated in a vertical plane, and -to bereciprocated in a horizontal plane; means adapted to reciprocate said saws vertically; and pressure means adapted to reciprocate aid saws horizontally, said two reciprocating means, being adapted to so co-act that the saws are pressed toward each other and into working position against said sides, respectively, under constant pressure for progressive cutting action on each downward stroke, moved slightly away from said mass at the end of the downward stroke and during a period of the upward stroke, and are held against horizontal movement during the remainder of the upward stroke.

3. In a sawing machine, the combination of means to support a mass of material to be sawed; a pair of saws disposed adjacent opposite sides of said mass, respectively, and adapted to be reciprocated in a vertical plane, and to be reciprocated in a horizontal plane; means adapted to reciprocate said saws vertically; and means adapted to reciprocate said saws horizontally, said two reciprocating means being adapted to so co-a'ct that the saws are moved into working position against a said sides, respectively, on each downward stroke,

and have horizontal movement into said mass for progressive cutting action during the whole of each downward stroke, are moved horizontally out of contact with said mass during a portion of each upward stroke, and are maintained immobile horizontallyduring the remainder ofeach upward stroke.

4. In a sawing machine, the combination of means to support a mass of material to be sawed; a pair of saws disposed adjacent opposite sides of said mass, respectively, and adapted to be reciprocated in a vertical plane, and to be reciprocated in a horizontal plane; means adapted to reciprocate said saws vertically; a single pressure means adapted to press said saws toward each other horizontally and into said mass for progressive cutting action during each downward stroke; and

means adapted to move said saws horizontally away from said mass, during a portion of each upward stroke, and maintain said saws immobile horizontally during the remainder of the upward stroke,

5. In a sawing machine, the combination of means to support a mass of material to be sawed; a pair of saws disposed adjacent opposite sides of said mass, respectively; a vertically reciprocatory frame in which said saws are mounted for horizontal reciprocation therein; a pair of horizontally reciprocable frames in which said saws are respectivel mounted for vertical reciprocation therein; a hydraulic system, comprising a high pressure circuit and a low pressure circuit adapted to reciprocate said pair of frames to move said saws toward and away from said mass, respectively; and means adapted to regulate the operation of said system, said regulating means being operated by the means for reciprocating said vertically moving frame.

6. In a sawing machine, the combination of means to support a mass of material to be sawed; a pair of saws disposed adjacent opposite sides of said mass, respectively, and adapted to'be reciprocated horizontally and vertically; a hydraulic system for reciprocating said saws horizontally, comprising a low pressure circuit and a high pressure circuit, said low pressure circuit exerting constant pressure tending to move said saws away from said mass, and valve means for controlling said high pressure circuit; and means for reciprocating said saws vertically, said vertically reciprocating means operating said valve means to render the high pressure circuit operative to move the saws toward the mass during each downward stroke, to render the high-pressure circuit inop erative to permit the low pressure circuit to move the saws away from said mass at the end of the downward stroke and a portion of the upward stroke, and to render both circuits inoperative to maintain the saws immobile horizontally durin the remainder of the upward stroke.

7. In a sawing machine, the combination of means to support a mass of material to be sawed; a pair of saws disposed adjacent opposite sides of said mass, respectively; a vertically reciprocatory frame in which said saws are mounted for horizontal reciprocation therein; a pair of horizontally reciprocable frames in which said saws are respectively mounted for vertical reciprocation therein; means for reciprocating said vertically reciprocatory frame; means for reciprocating said horizontally reciprocable frames; and means for so limiting the reciprocation of said horizontally reciprocable frames that the saws function alternately as they-reach an area of the :mass closely adjacent its longitudinal axis.

8. In a sawing machine, the combination of mean'sto support a mass of'material to be sawed;

a pai'rof saws disposed adjacent opposite sides 5 of said mass, respectively; a vertically reciprocatory frame in which said saws are mounted for horizontal reciprocation therein; apair of horizontally'reciprocable frames in which said. saws 

